Print current call stack from a method in Python code

Question

In Python  how can I print the current call stack from within a method  for debugging purposes

User · Answer

Install Inspect-it  pip3 install inspect-it --user   Code  import inspect print     n x1b 0 36 1m   x1b 0 32 1m  25  x1b 0 36 1m   x1b 0 35 1m    format str x function   x filename   x1b 0 31 1m   str x lineno    x1b 0m   for x in inspect stack       you can Make a snippet of this line  it will show you a list of the function call stack with a filename and line number  list from start to where you put this line

User · Answer

Here s an example of getting the stack via the traceback module  and printing it   import traceback  def f        g    def g        for line in traceback format stack            print line strip     f      Prints    File  so-stack py   line 10  in  lt module gt        f     File  so-stack py   line 4  in f       g     File  so-stack py   line 7  in g       for line in traceback format stack      If you really only want to print the stack to stderr  you can use   traceback print stack     Or to print to stdout  useful if want to keep redirected output together   use   traceback print stack file sys stdout    But getting it via traceback format stack   lets you do whatever you like with it

User · Answer

If you use python debugger  not only interactive probing of variables but you can get the call stack with the  where  command or  w    So at the top of your program  import pdb   Then in the code where you want to see what is happening  pdb set trace     and you get dropped into a prompt

User · Answer

for those who need to print the call stack while using pdb  just do   Pdb  where

User · Answer

Here s a variation of  RichieHindle s excellent answer which implements a decorator that can be selectively applied to functions as desired  Works with Python 2 7 14 and 3 6 4   from   future   import print function import functools import traceback import sys  INDENT   4      def stacktrace func        functools wraps func      def wrapped  args    kwds             Get all but last line returned by traceback format stack             which is the line below          callstack     n  join  INDENT line strip   for line in traceback format stack     -1           print       called   format func   name             print callstack          return func  args    kwds       return wrapped   stacktrace def test func        return 42  print test func      Output from sample   test func   called      File  stacktrace decorator py   line 28  in  lt module gt      print test func    42

User · Answer

inspect stack   returns the current stack rather than the exception traceback   import inspect print inspect stack     See https   gist github com FredLoney 5454553 for a log stack utility function

User · Answer

import traceback traceback print stack

[python] Print current call stack from a method in Python code

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